added simple flight termination state machine which enbales parachute on request

1 files changed, 51 insertions, 0 deletions

diff --git a/src/modules/commander/state_machine_helper.cpp b/src/modules/commander/state_machine_helper.cpp
index a50af7daf..6c21dfab0 100644
--- a/src/modules/commander/state_machine_helper.cpp
+++ b/src/modules/commander/state_machine_helper.cpp
@@ -65,6 +65,7 @@ static const int ERROR = -1;
 static bool arming_state_changed = true;
 static bool main_state_changed = true;
 static bool navigation_state_changed = true;
+static bool flighttermination_state_changed = true;
 
 transition_result_t
 arming_state_transition(struct vehicle_status_s *status, const struct safety_s *safety,
@@ -451,6 +452,18 @@ check_navigation_state_changed()
 	}
 }
 
+bool
+check_flighttermination_state_changed()
+{
+	if (flighttermination_state_changed) {
+		flighttermination_state_changed = false;
+		return true;
+
+	} else {
+		return false;
+	}
+}
+
 void
 set_navigation_state_changed()
 {
@@ -523,6 +536,44 @@ int hil_state_transition(hil_state_t new_state, int status_pub, struct vehicle_s
 }
 
 
+/**
+* Transition from one flightermination state to another
+*/
+transition_result_t flighttermination_state_transition(struct vehicle_status_s *status, flighttermination_state_t new_flighttermination_state, struct vehicle_control_mode_s *control_mode)
+{
+	transition_result_t ret = TRANSITION_DENIED;
+
+		/* only check transition if the new state is actually different from the current one */
+		if (new_flighttermination_state == status->navigation_state) {
+			ret = TRANSITION_NOT_CHANGED;
+
+		} else {
+
+			switch (new_flighttermination_state) {
+			case FLIGHTTERMINATION_STATE_ON:
+				ret = TRANSITION_CHANGED;
+				status->flighttermination_state = FLIGHTTERMINATION_STATE_ON;
+				warnx("state machine helper: change to FLIGHTTERMINATION_STATE_ON");
+				break;
+			case FLIGHTTERMINATION_STATE_OFF:
+				ret = TRANSITION_CHANGED;
+				status->flighttermination_state = FLIGHTTERMINATION_STATE_OFF;
+				break;
+
+			default:
+				break;
+			}
+
+			if (ret == TRANSITION_CHANGED) {
+				flighttermination_state_changed = true;
+				control_mode->flag_control_flighttermination_enabled = status->flighttermination_state == FLIGHTTERMINATION_STATE_ON;
+			}
+		}
+
+		return ret;
+}
+
+
 
 // /*
 //  * Wrapper functions (to be used in the commander), all functions assume lock on current_status